They are purposefully making Reddit absolutely terrible on mobile web browsers. They constantly try to force you to download the app, don't let you read full threads without it, etc. It seems it just constantly gets worse and worse.
i.reddit.com is the mobile equivalent, but is also terrible.
try http://reddit.premii.com/ there also https://hn.premii.com/ .
I've switched over to https://teddit.net both on desktop and mobile.